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Method for multihop routing for distributed wlan networks

Active Publication Date: 2005-01-20
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when these routing protocol are used above the 802.11 protocol to provide multihop routing in the ad hoc network without any connection to the radio access protocol, performance problems will arise.
For example, when a packet has to travel multiple hops between wireless stations to reach a destination, severe delays may arise due to the nature of the wireless protocol.
Collisions can also occur on each link, and the access delays on each hop can add up.

Method used

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  • Method for multihop routing for distributed wlan networks
  • Method for multihop routing for distributed wlan networks
  • Method for multihop routing for distributed wlan networks

Examples

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Embodiment Construction

[0020] Referring now to the drawings, and more particular to FIG. 1, where there are illustrated a number of STAs 10 within three separate IBSSs 15. FIG. 1 illustrates a multihop connection between STA A and STA B. The connection ultimately includes three hops between STA A and STA B using two other STAs 10 in order to establish the connection. According to the present invention, an addition is proposed to the EEE 802.11 protocol. In this proposal, the NAV value at STA nodes within multihop route are expanded to cover a chain of hops between multiple STAs rather than only covering a single link. The NAV value protects transmissions from collision and interference. In this manner, once a multihop route has been established between two STAs 10, the delays for transmitting the payload will be relatively short.

[0021] By extending the NAV value to cover multiple links, the overall capacity of the system will be decreased due to the fact that a larger part of the BSS bandwidth is granted...

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Abstract

A method for multihop packet trasmissions in a wireless network involves establishing a multihop route through the wireless network. After establishment of the multihop route, transmission protocol parameter are altered to minimize delays for transmissions over the multihop route and at least one packet is transmitted over the multihop route according to the altered transmission protocol parameters. In a first embodiment, the altering of the transmission protocol parameters includes setting a NAV value at each node of the multihop route for a duration of the packet transmissions over the route. In an alternative embodiment, multihop packets are assigned a higher QoS value.

Description

RELATED APPLICATIONS [0001] This application claims priority from and incorporates herein by reference the entire U.S. Provisional Application Ser. No. 60 / 326,059, filed on Sep. 27, 2001.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to distributed wireless local area networks, and more particularly, to a method for more efficiently transmitting data within a wireless local area network system using a multihop mechanism. [0004] 2. Description of the Related Art [0005] The IEEE (802.11) wireless local area network (WLAN) system enables communication between Stations (STAs) and an Access Point (AP) in an infrastructure system or an infrastructure less system (also called Independent BSS or ad hoc network mode). The IEEE 802.11 WLAN system enables single hop communication between STAs in IBSS (Independent Basic Service Set) mode. The access mechanism is a distributed mechanism called Distributed Coordination Function (DCF) and is based...

Claims

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Application Information

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IPC IPC(8): H04B7/26H04L12/26H04L12/28H04L12/56H04W28/18H04W28/24H04W40/02H04W40/24H04W74/08H04W76/02H04W80/00H04W84/12
CPCH04L45/00H04L45/121H04L47/10H04L47/14H04L47/2408H04L47/283H04W84/12H04W28/24H04W40/02H04W40/246H04W74/08H04W76/02H04W80/00H04W28/18H04W76/10H04W28/02H04W8/04
Inventor LINDSKOG, JANRYDNELL, GUNNARLARSSON, PETER
Owner TELEFON AB LM ERICSSON (PUBL)
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